Shutdown anyone's power with one button
Using a cargo crate button either salvaged from a real crate or printed from a blueprint it is possible to shut down any grids power, and any other grid connected by means of pistons, rotors, merge blocks, connectors or whatever else there is to link grids.
This shutdown at the very least impacts batteries and reactors and stops them outputting or receiving power regardless of mode.
This impacts any other grids docked to the target grid too so one docked ship can turn off power to an entire carrier and all other associated docked ships too.
The most important part: The shutdown effect does not seem to care who owns the button or the reactors and will bypass faction and ownership restrictions meaning you can shutdown /anything/ you can connect one of these buttons to by any means.